8. Bane Traps A Tumbler In His Lair Just To Make A Point To Bruce
The first showdown between Bane and Batman is the start of the films destructive middle act. After an hour or so of set up suddenly all the things that looked indestructible (Batman, Gothams bridges) are spectacularly broken down. To hammer home both the mental failure of Batman after a fight that humiliatingly shows his physical inferiority Bane reveals hes known about his hidden armoury the whole time (probably through Miranda Tates connections plot hole callers). He shows this to Bruce by bringing one of the Tumblers down into his lair. From a creative aspect this decision is obvious - its the only way for Bruce to see it - but its pretty dumb from a character standpoint. Wayne Enterprises doesn't have a massive supply of them, so why decommission one by trapping it in the sewers? Later on in the film, when the Wayne Board are being brought to the nuclear reactor, you can see some of Banes men working on a Tumbler. Even if they did want them in the sewers to modify them, theres better ways to bring them down than destroying a whole floor.